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<?php
/**
* @version $Id: stack.php 4629 2012-05-06 22:11:00Z johanjanssens $
* @package Koowa_Template
* @copyright Copyright (C) 2007 - 2012 Johan Janssens. All rights reserved.
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
* @link http://www.nooku.org
*/
/**
* Object Stack Class
*
* Implements a simple stack collection (LIFO)
*
* @author Johan Janssens <johan@nooku.org>
* @package Koowa_Object
*/
class ComDocmanObjectStack extends KObject implements Countable
{
/**
* The object container
*
* @var array
*/
protected $_object_stack = null;
/**
* Constructor
*
* Prevent creating instances of this class by making the contructor private
*/
public function __construct(KConfig $config)
{
parent::__construct($config);
$this->_object_stack = array();
}
/**
* Peeks at the element from the end of the stack
*
* @param mixed The value of the top element
*/
public function top()
{
return end($this->_object_stack);
}
/**
* Pushes an element at the end of the stack
*
* @param mixed The object
* @return KObjectStack
*/
public function push(KObject $object)
{
$this->_object_stack[] = $object;
return $this;
}
/**
* Pops an element from the end of the stack
*
* @return mixed The value of the popped element
*/
public function pop()
{
return array_pop($this->_object_stack);
}
/**
* Counts the number of elements
*
* @return integer The number of elements
*/
public function count()
{
return count($this->_object_stack);
}
/**
* Check to see if the registry is empty
*
* @return boolean Return TRUE if the registry is empty, otherwise FALSE
*/
public function isEmpty()
{
return empty($this->_object_stack);
}
}
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